9+21=3-4a

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Solution for 9+21=3-4a equation: 



9+21=3-4a

We move all terms to the left:

9+21-(3-4a)=0

We add all the numbers together, and all the variables

-(-4a+3)+9+21=0

We add all the numbers together, and all the variables

-(-4a+3)+30=0

We get rid of parentheses

4a-3+30=0

We add all the numbers together, and all the variables

4a+27=0

We move all terms containing a to the left, all other terms to the right

4a=-27

a=-27/4

a=-6+3/4

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